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跨膜电阻仪 EVOM2
跨膜电阻仪EVOM2是最新一代用于特异性完成组织培养研究中TEER测量的电阻仪，与第一代的EVOM相比具有操作更简单，使用更轻松的特点。EVOM2不仅可以定性地测量单层贴壁细胞的健康状态，而且也能定量地测量单层细胞的融合情况。
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跨膜电阻仪EVOM2是最新一代用于特异性完成组织培养研究中TEER测量的电阻仪，与第一代的EVOM相比具有操作更简单，使用更轻松的特点。EVOM2不仅可以定性地测量单层贴壁细胞的健康状态，而且也能定量地测量单层细胞的融合情况。
独特的EVOM2 电路设计和STX2电极的完美结合，让其可以监测单层细胞的融合状态，当与WPI 公司设计的单个小室结合使用时，它也可以用来完成更加精确的定量测量
或更低电阻的测量，如血脑屏障(BBB)内皮生长电阻测量。
工作原理
通过主机产生10 μA的恒定跨膜电流，同时以一定的频率反转电极的极性，从而电极和膜均无电荷累积，10 μA 的电流通过STX2 的两个电流电极（I1和I2）跨过细胞膜，另一对电极（V1和V2）测量达到10 μA电流所需要的电压，并将信息发送给处理器。处理器根据欧姆定律将其转化为欧姆，在读数表上显示数字。因为电流是固定的10 μA，因此很容易转化出测量结果。如在膜电阻为1000 Ω时，10 μA电流通过的电压应是10 mV；
在膜电阻为200 Ω时，10 μA的电流将产生2 mV的电压；不论何种情况，在膜或电极上消耗的能量都非常少。
EVOM2参数
| 膜电压测量范围 | ±200 mV |
| 电压测量精度 | 0.1 mV |
| 电阻测量范围 | 0-9,999 Ω |
| 电阻测量分辨率 | 1 Ω |
| 交流方波电流 | 12.5 Hz 时额定±10 μA |
| 内置充电电池 | 6V可充电镍氢电池 |
| BNC 模拟输出 | 1-10 V ( 1 mV / Ω ) |
| 外部供电 | 12 V直流 |
| 额定电池运行时间 | 10 小时 |
| 尺寸 | 19cm x11cm x 6 cm |
| 重量 | 1.4 kg |
| 电极连接 | RJ-11 连接头 |
| 测试电阻 | 外部的 |
| 使用环境 | 10-38 ℃ 0-90%非凝结相对湿度 |
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产品用途
■ 研究血脑屏障内皮细胞的药物和营养物质转运
■ CaCo-2大肠癌细胞或其它粘膜或上皮癌细胞的药效学研究
■ 培养的肠道粘膜细胞的药物吸收和营养物质转运研究
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